Brother Genuine Drum Unit. Print and copy with this toner drum. Designed for use in select Brother printers, the toner delivers crisp sharp text and images to keep up with daily demand. This Brother DR 520 drum unit is an OEM product, installing quickly and eliminating downtime. This OEM quality laser drum cartridge works with your toner cartridge (sold separately) to provide clean, sharp printing. Specifically engineered for superior reliability in your printer. Snaps easily into place with minimal fuss. Easy to install for fast replacement.